ALTBIB provides access to PubMed citations for users seeking information on alternatives to animal testing. Development of alternative methods is an active area of research. The ALTBIB search tool provides users with access via PubMed to the latest research on in vitro and computational methods to predict toxicity, as well as approaches to refining animal use for study types that still require animals. ALTBIB also provides links to additional resources on alternative methods research and acceptance.